Instructs the speech synthesizer how to generate the output audio content.
JSON representation |
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{ "audioEncoding": enum ( |
Fields | |
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audioEncoding |
Required. Audio encoding of the synthesized audio content. |
sampleRateHertz |
Optional. The synthesis sample rate (in hertz) for this audio. If not provided, then the synthesizer will use the default sample rate based on the audio encoding. If this is different from the voice's natural sample rate, then the synthesizer will honor this request by converting to the desired sample rate (which might result in worse audio quality). |
synthesizeSpeechConfig |
Optional. Configuration of how speech should be synthesized. |
OutputAudioEncoding
Audio encoding of the output audio format in Text-To-Speech.
Enums | |
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OUTPUT_AUDIO_ENCODING_UNSPECIFIED |
Not specified. |
OUTPUT_AUDIO_ENCODING_LINEAR_16 |
Uncompressed 16-bit signed little-endian samples (Linear PCM). Audio content returned as LINEAR16 also contains a WAV header. |
OUTPUT_AUDIO_ENCODING_MP3 |
MP3 audio at 32kbps. |
OUTPUT_AUDIO_ENCODING_MP3_64_KBPS |
MP3 audio at 64kbps. |
OUTPUT_AUDIO_ENCODING_OGG_OPUS |
Opus encoded audio wrapped in an ogg container. The result will be a file which can be played natively on Android, and in browsers (at least Chrome and Firefox). The quality of the encoding is considerably higher than MP3 while using approximately the same bitrate. |
OUTPUT_AUDIO_ENCODING_MULAW |
8-bit samples that compand 14-bit audio samples using G.711 PCMU/mu-law. |
SynthesizeSpeechConfig
Configuration of how speech should be synthesized.
JSON representation |
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{
"speakingRate": number,
"pitch": number,
"volumeGainDb": number,
"effectsProfileId": [
string
],
"voice": {
object ( |
Fields | |
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speakingRate |
Optional. Speaking rate/speed, in the range [0.25, 4.0]. 1.0 is the normal native speed supported by the specific voice. 2.0 is twice as fast, and 0.5 is half as fast. If unset(0.0), defaults to the native 1.0 speed. Any other values < 0.25 or > 4.0 will return an error. |
pitch |
Optional. Speaking pitch, in the range [-20.0, 20.0]. 20 means increase 20 semitones from the original pitch. -20 means decrease 20 semitones from the original pitch. |
volumeGainDb |
Optional. Volume gain (in dB) of the normal native volume supported by the specific voice, in the range [-96.0, 16.0]. If unset, or set to a value of 0.0 (dB), will play at normal native signal amplitude. A value of -6.0 (dB) will play at approximately half the amplitude of the normal native signal amplitude. A value of +6.0 (dB) will play at approximately twice the amplitude of the normal native signal amplitude. We strongly recommend not to exceed +10 (dB) as there's usually no effective increase in loudness for any value greater than that. |
effectsProfileId[] |
Optional. An identifier which selects 'audio effects' profiles that are applied on (post synthesized) text to speech. Effects are applied on top of each other in the order they are given. |
voice |
Optional. The desired voice of the synthesized audio. |
VoiceSelectionParams
Description of which voice to use for speech synthesis.
JSON representation |
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{
"name": string,
"ssmlGender": enum ( |
Fields | |
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name |
Optional. The name of the voice. If not set, the service will choose a voice based on the other parameters such as languageCode and For the list of available voices, please refer to Supported voices and languages. |
ssmlGender |
Optional. The preferred gender of the voice. If not set, the service will choose a voice based on the other parameters such as languageCode and |
SsmlVoiceGender
Gender of the voice as described in SSML voice element.
Enums | |
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SSML_VOICE_GENDER_UNSPECIFIED |
An unspecified gender, which means that the client doesn't care which gender the selected voice will have. |
SSML_VOICE_GENDER_MALE |
A male voice. |
SSML_VOICE_GENDER_FEMALE |
A female voice. |
SSML_VOICE_GENDER_NEUTRAL |
A gender-neutral voice. |